ns250f

**Tue Oct 07, 2014 5:02 pm » Post: #1 » Download Post**

Hello!

Two months earlier i bought this beautiful old school Honda NS250F

This bike was sitting in the garage for almoust 10 years, and then i bought it.

My friend cleaned both carbs, changed fuel filter, hoses, made nev ignition key and engine started.

Now i need to change cillinder gasket and find out why ATAC sistem doesn`t work...

**Tue Oct 07, 2014 5:14 pm » Post: #2 » Download Post**

That's cool! And welcome to our first ever forum member from Latvia! Smile

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Andy.
NSR-WORLD.COM

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**Tue Oct 07, 2014 6:26 pm » Post: #3 » Download Post**

thanx

I will keep posting updates.
Maybe someone knows where i can buy a head gasket?

**Wed Oct 08, 2014 11:38 am » Post: #4 » Download Post**

I did a quick search and only found complete gasket sets. I think you would have more luck if you get a Honda parts guide. You sometimes see them in ebay and more likely on Yahoo Japan.
I use www.jauce.com to buy from Yahoo
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**Sat Oct 11, 2014 4:26 pm » Post: #5 » Download Post**

i had a problem, one cylinder doesn`t work, there is too much fuel pumping and spark gets wet.
what size is main jet`s in the carbs? Because one is bigger than another, maybe that`s why it flushes fuel too much.

And i noticed that there is something broken in the exhaust, we cut it open and the noise was from the whistle, i threw it away, and welded back.

**Sun Oct 12, 2014 1:39 pm » Post: #6 » Download Post**

It is common for "Vees" (both 2-stroke and 4-stroke) to have different size main jets (and often needles and/or power jets) in the front and rear cylinders.

If you look on the NSR carb settings page in the Tech section, you will see that even the models with the same main jet have different needles front and rear.
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Andy.
NSR-WORLD.COM

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**Sun Oct 12, 2014 1:40 pm » Post: #7 » Download Post**

It is normal for v twin engen to have different size jets
Look at your needle and seat if the still work fine

**Sun Oct 12, 2014 3:52 pm » Post: #8 » Download Post**

Is there somewhere carb settings for mc11 like this?

**Sun Oct 12, 2014 3:56 pm » Post: #9 » Download Post**

this was how bad carbs looked before general cleaning

**Sun Oct 12, 2014 4:04 pm » Post: #10 » Download Post**

front cilinder had problem with gasket, found out that bolts were loose.
ATAC system was totally sticked together with dried oil and gas.

**Sun Oct 12, 2014 4:14 pm » Post: #11 » Download Post**

small video, one cylinder works only, still trying to solve the problem. Cold engine runs ok, but couple minutes later only on 1 cylinder
https://www.youtube.com/watch?v=x8q7Fw2hGSA&feature=youtu.be

**Fri Nov 20, 2020 4:45 am » Post: #12 » Download Post**

Jubins wrote:i had a problem, one cylinder doesn`t work, there is too much fuel pumping and spark gets wet.
what legal steroids are sold at gnc size is main jet`s in the carbs? Because one is bigger than another, maybe that`s why it flushes fuel too much.

And i noticed that there is something broken in the exhaust, we cut it open and the noise was from the whistle, i threw it away, and welded back.

The Honda NS250F and the Honda NS250R are filled with bold style and a newly designed liquid-cooled 2-stroke 90 Degree V-twin engine (displacement is 249cm3). ... The NS250F/R was developed using the latest sophisticated technologies gained from the 1983 MotoGP world Champion racer "Honda NS500".

**Tue Feb 23, 2021 12:11 pm » Post: #13 » Download Post**

Soo cool

**Tue Feb 23, 2021 2:42 pm » Post: #14 » Download Post**

Hi drebins, did you find the problem and get the nsf sorted ?
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